With respect to text{ABO} blood groups,how ma | vedclass

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(A) The $	ext{ABO}$ blood grouping in humans is controlled by the gene $I$. The gene $I$ has three alleles: $I^A$,$I^B$,and $i$.Since there are three

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$6 \ \& \ 4$

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(A) The $	ext{ABO}$ blood grouping in humans is controlled by the gene $I$. The gene $I$ has three alleles: $I^A$,$I^B$,and $i$.Since there are three alleles,the possible genotypes are determined by the combinations of these alleles taken two at a time (including homozygotes). These are: $I^A I^A$,$I^A i$,$I^B I^B$,$I^B i$,$I^A I^B$,and $ii$. Thus,there are $6$ possible genotypes.The phenotypes are determined by the expression of these alleles. $I^A$ and $I^B$ are dominant over $i$,and $I^A$ and $I^B$ are codominant with each other. The possible phenotypes are: Blood group $A$ (from $I^A I^A$ or $I^A i$),Blood group $B$ (from $I^B I^B$ or $I^B i$),Blood group $AB$ (from $I^A I^B$),and Blood group $O$ (from $ii$). Thus,there are $4$ possible phenotypes.Therefore,the number of genotypes is $6$ and the number of phenotypes is $4$.

With respect to $\text{ABO}$ blood groups,how many genotypes and phenotypes,respectively,are possible in the human population?

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